The Trumpeter KV-II is probably the best out there at the moment, and cheap too! Two things to watch for are the wonky separate muzzle (which has an off-center bore) and the nice recessed ejector pin marks on the inside faces of the link and length tracks and under the fenders. Also, watch out for the orientation of the road wheel center inserts - they are not keyed so they can end up misaligned. Look at the relative orientation of the bolt pattern on the outer rim and inner insert on the box art. I didn't and all my road wheels have misaligned bolt patterns! I think I read somewhere that the "sectioned" gun barrel should look like one piece so fill in the two recessed lines.
I replaced my gun tube with an aluminum one, but it still had the section marks. But the wonky muzzle opening was cured and I got rifling inside the barrel. I also went for metal wire tow cables and replaced the turret grab handles with brass wire.
HTH